Method for treating wastewater from dairy processing

A technology for processing wastewater and treatment methods, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. To biomass requirements and other issues, to achieve the effect of solving insufficient hydrolysis and acidification, solving subsequent treatment problems, and low effluent COD

Inactive Publication Date: 2012-06-20
INNER MONGOLIA YILI INDUSTRIAL GROUP CO LTD
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  • Application Information

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Problems solved by technology

When the water quality inside the regulating tank is not completely homogeneous and acid-base neutralized, it is not conducive to the normal reproduction of hydrolytic microorganisms and bacteria, and at the same time, the biomass cannot meet the biomass requirements of the hydrolysis regulating tank process.
The annual average COD concentration of production water is about 3500mg/L, which has exceeded the load range of subsequent anaerobic, aerobic, and biological strain treatments. In order to maintain the stable operation of the entire wastewater treatment process, the wastewater treatment process first disables hydrolysis The mixing equipment in the regulating tank promotes the homogeneous acidification and flocculation of the excess organic matter in the wastewater under the condition of a hydraulic retention time of 8-10 hours in the hydrolysis regulating tank, which leads to the milk scale natur...

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  • Method for treating wastewater from dairy processing

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Effect test

Embodiment 1

[0034] Example 1 Treatment of dairy processing wastewater

[0035] Treat 4,500 tons of dairy processing wastewater, of which the dairy processing wastewater mainly comes from high-concentration production wastewater produced by the processing and cleaning of containers, pipes, and equipment in production units such as liquid milk, cold drinks, milk powder, and raw milk, as well as production workshops Compared with the lower concentration of production wastewater and some domestic wastewater produced by site cleaning.

[0036] Use the treatment method of dairy processing waste water of the present invention, comprise the following steps:

[0037] 1) Discharge the waste water into the hydrolysis regulating tank through the mechanical grid for hydrolysis and acidification, and at the same time, reflow the aerobic activated sludge with 0.27%-0.8% of the pool capacity at the water inlet and stir it, and stir it twice a day for 10 minutes each time;

[0038] The hydrolysis regulat...

Embodiment 2

[0051] Taking the treatment of dairy processing wastewater in Jinchuan Wastewater Treatment Plant of Yili Group as an example, the implementation and effects of the present invention are introduced.

[0052] (1) Introduction of Jinchuan Wastewater Treatment Plant

[0053] Yili Group's Jinchuan Wastewater Treatment Plant is currently a relatively large-scale wastewater treatment plant in the domestic food industry. It adopts the more advanced "UASB+SBR" process and is designed to treat 10,000 tons of wastewater per day. The treated wastewater has reached the national wastewater comprehensive discharge level 1 standard. In recent years, the daily wastewater treatment volume of the wastewater treatment plant has reached an average of 5,500 tons, and the peak time is more than 10,000 tons. The average influent COD is 3,500 mg / L, and the peak time is 5,000 mg / L.

[0054] (2) The use of the improved UASB+SBR method to treat wastewater and existing problems

[0055] 1. In terms of ...

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Abstract

The invention belongs to the field of wastewater treatment and particularly relates to a method for treating wastewater from dairy processing, comprising the following steps: (1) discharging the wastewater into a hydrolyzing adjusting pool through a machinery grille to be subjected to hydrolysis and acidification; (2) making the wastewater subjected to hydrolysis and acidification in the hydrolyzing adjusting pool enter an UASB (upflow anaerobic sludge bed) through an oil removing settling pond and a clear water pool to be subjected to anaerobic treatment; and (3) making the wastewater treated in the UASB reactor enter an SBR (sequencing batch reactor) to be subjected to aerobic treatment. The water from the hydrolyzing adjusting pool is more beneficial for anaerobic bacteria to ferment and gasify and play a role so that the yield of biogas increases gradually, the saving of power consumed by the subsequent aerobic process is considerable, the COD (chemical oxygen demand) of the water is low, and the problem on the subsequent treatment of a large number of scrum can be solved. The yield of the aerobic sludge decreases by 30%-50%, and the sludge dewatering and external transporting expenses are saved.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular, the invention relates to a treatment method for dairy processing wastewater. Background technique [0002] UASB method, that is, anaerobic biological treatment method, refers to the process of decomposing and converting various complex organic matters in wastewater into methane and carbon dioxide through the action of anaerobic microorganisms (including facultative microorganisms) under the condition of no molecular oxygen. . Also known as anaerobic digestion. The main objects of treatment are: (1) high-concentration organic wastewater; (2) sludge treatment; (3) treatment of biologically refractory organic wastewater; (4) biological denitrification and phosphorus removal. [0003] The UASB method has a large load capacity and is suitable for the treatment of high-concentration organic wastewater. A well-run UASB has a high removal rate of organic pollutants, does not require ...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 孙瑞国云俊平郭栋梁
Owner INNER MONGOLIA YILI INDUSTRIAL GROUP CO LTD
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